This study is focused on the optimization of the amount of DADMAC incorporating in the DMA-DADMAC copolymers by controlling the copolymer composition drift during semi-batch experiments in which one comonomer (DMA) is flowed into the reactor. This allows copolymers with designed composition, sequence length, molecular mass and viscosity to be obtained during semi-batch copolymerization reactions under different monomer flow schemes. The impact of the higher amount of DADMAC incorporated on the copolyelectrolyte properties is also studied.